Remove leading and trailing spaces
March 10, 2013 in iOS Snippets
Removing start and end spaces of an NSString is very simple:
NSString* result = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
Monthly Archives: March 2013
Converting an integer in a string into an NSNumber
March 10, 2013 in iOS Snippets
This new idiom is concise and clean:
NSNumber* intNumber = @([str intValue]);
Synchronous dispatch without deadlocking
March 4, 2013 in iOS Snippets
Dispatches synchronously without deadlocking if the target thread is the current thread.
static inline void dispatch_sync2(dispatch_queue_t queue, dispatch_block_t block) {
if (dispatch_get_current_queue() == queue) {
block();
} else {
dispatch_sync(queue, block);
}
}
NSMutableString to NSString
March 4, 2013 in iOS Snippets
Method 1, making a copy:
NSString* str = [mutableStr copy];
Method 2, also making a copy:
NSString* str = [NSString stringWithString:mutableStr];
Method 3, passing the original mutable string as an NSString by casting (almost never used):
NSString* immutableRefToMutableString = (NSString*)mutableStr;